Twitter essentially is a 'micro blogging site'. WHat that actually means is that people are given 140 characters in which to convey messages. It is a broadcast medium where you choose to 'follow' any number of other users. For example, I have a lot of the top riders in the Tour on my follow list so I get nice little updates from Bradley Wiggins, Lance Armstrong, Levi Leipheimer etc every day. It's an insight into other peoples lives and I love it. I also follow friends and family to keep up to date and I tend to mention anything from the last MTB ride to how my garden is growing. It's up to others if they are interested or not but I have a few followers.